Setting Addon options

help
1

Its been quite unclear on how to set addon configuration values.
I am trying to change the host of the onboarding app but am unable to.

Steps to reproduce the problem:
  1. mitmproxy -T --host --set onboarding-host=mitmm.it or mitmproxy --host --app-host=mitmm.it
  2. Navigate to mitmm.it on your iphone/browser (with the root certificate installed)
  3. 404 is returned
Any other comments? What have you tried so far?

I am fairly certain that I am not setting the values correctly. But I cant seem to figure out how to use options, get options.

System information

mitmproxy 0.18.2

Update 1

I now understand that mitmm.it is rightly returning 404. As there is no dns mapping pointing mitmm.it to localhost.

However I cant seem to figure out where to set this DNS entry.
I tried /etc/hosts but that does not seem to work.